L53.9 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software

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Code lookupL53.9

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the skin and subcutaneous tissue (L00-L99) / Urticaria and erythema (L49-L54)

L53.9

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Erythematous condition, unspecified

Erythematous condition, unspecified, refers to red or inflamed skin of unknown cause or type that cannot be more specifically classified.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

L53Other erythematous conditions L53.9Erythematous condition, unspecified

Inclusion Terms

Official

Erythema NOS
Erythroderma NOS

Excludes 2

Official

certain conditions originating in the perinatal period (P04-P96)Inherited from L00-L99
certain infectious and parasitic diseases (A00-B99)Inherited from L00-L99
complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from L00-L99
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from L00-L99
endocrine, nutritional and metabolic diseases (E00-E88)Inherited from L00-L99
lipomelanotic reticulosis (I89.8)Inherited from L00-L99
neoplasms (C00-D49)Inherited from L00-L99
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from L00-L99
systemic connective tissue disorders (M30-M36)Inherited from L00-L99
viral warts (B07.-)Inherited from L00-L99

Related Codes

Official

L53.0Toxic erythema L53.1Erythema annulare centrifugum L53.2Erythema marginatum L53.3Other chronic figurate erythema L53.8Other specified erythematous conditions

Includes

Official

No Includes notes are included in this display for L53.9. Check the code and parent instructions in the Code Book.

Excludes 1

Official

Lyme disease (A69.2-)Inherited from L49-L54, L53
rosacea (L71.-)Inherited from L49-L54, L53
erythema ab igne (L59.0)Inherited from L49-L54, L53
erythema due to external agents in contact with skin (L23-L25)Inherited from L49-L54, L53
erythema intertrigo (L30.4)Inherited from L49-L54, L53

Code First

Official

No Code First sequencing instructions are included in this display for L53.9. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for L53.9. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for L53.9. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Use L53.9 when the provider wording supports erythematous condition, unspecified. Check the FY2026 tabular notes and the full code path before the final code choice.

For this DOS, capture the provider's current assessment and the care action documented for erythematous condition, unspecified. Keep the checklist tied to the note.

Do not swap L53.9 with L53.0. The FY2026 tabular describes L53.0 as toxic erythema. Follow the documented detail.

Ask Buddy to show the official notes for L53.9 or compare its code path with L53.0.

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is L53.9 an HCC code?

No. L53.9 is a billable ICD-10-CM code with no mapping under the current CMS-HCC V28 community payment model, and none under the ESRD, Part D RxHCC, or HHS-HCC models.

Code: L53.9
Description: Erythematous condition, unspecified
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

Coder workflow notes

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What This Code Means

L53.9 is the ICD-10-CM diagnosis code for erythematous condition, unspecified. Erythematous condition, unspecified, refers to red or inflamed skin of unknown cause or type that cannot be more specifically classified. L53.9 sits in the ICD-10-CM chapter for diseases of the skin and subcutaneous tissue (l00-l99), within the section covering urticaria and erythema (l49-l54).

L53.9 is a billable ICD-10-CM code, but no current CMS-HCC V28 community payment mapping is shown, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.

Use L53.9 when the provider wording supports erythematous condition, unspecified. Check the FY2026 tabular notes and the full code path before the final code choice.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for L53.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use L53.9 when the provider wording supports erythematous condition, unspecified. Check the FY2026 tabular notes and the full code path before the final code choice.
•For this DOS, capture the provider's current assessment and the care action documented for erythematous condition, unspecified. Keep the checklist tied to the note.
•Do not swap L53.9 with L53.0. The FY2026 tabular describes L53.0 as toxic erythema. Follow the documented detail.
•Ask Buddy to show the official notes for L53.9 or compare its code path with L53.0.